With the increasing penetration rate of power electronic equipment in power grid, the resonance phenomenon of power grid is becoming more and more serious, which seriously affects the normal operation of power equipment and the safe operation of power system. A resonance frequency sensitivity analysis method for power grid based on singular value decomposition (SVD) is proposed to address the limited applicability of existing modal frequency sensitivity calculation methods. The basis and process of the proposed method are given in detail. The non-homogeneous formula is used to solve the key variable expression, which avoids the influence of frequency resolution, improves the calculation accuracy, and effectively overcomes the deficiency that the modal frequency sensitivity cannot analyze the characteristics of branch current resonance. Numerical examples analysis shows that the proposed method can analyze the influence of network component parameters on the resonant frequency and quantize the influence of component parameters on the resonant frequency in two cases of low frequency and medium-high frequency resonance.